My Audi A4 130 bhp diesel is a lovely car with only 56000 miles. it runs great but on start up, especially when cold it only starts on 3 cylinders and smokes heavily. once you driveit goes on to 4 cylinders and the smoking stops. Any ideas

Nigel D, November 2008

Sound like a dribbling injector, Quick, cheap fix, buy some Diesel injector cleaner. Warm the engine to running temp 90 degs approx. Add a small amount of cleaner, neat into to the Fuel filter. Drive the car hard, for atleast 10-15 Mins to clear the system you should see black smoke in your rear view. This should be a quick/cheap fix, if not more expensive intrusive maintenance required.

Another Nigel C, January 2010

buy a petrol car Diesel's are for farm tractors or HGV's

P, November 2008